代码首先读入数据，然后输出主体和数据表头。

The code first reads in the data, then prints both the body and data headers.

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首先读入xml_rddl类文件，初始化xml_rddl类的一个实例。

To begin, it reads the XML_RDDL class file, and initializes an instance of the XML_RDDL class.

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它首先读入XML_NITF类文件并初始化xml_nitf类的实例。

To begin, it reads in the XML_NITF class file, and initializes an instance of the XML_NITF class.

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